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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c67b84f14b07b89c38cb02dfa673626563062abf6d7f06548eb97bab062859f7' 
  AND token = '14bl2BKNhL1IfRbCJz22/s+5+qy/o9XhmUJ98PB3A20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}