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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52afd6bafd92980baef6c84c0ee6a87dd013026bde65585ba5541091f3045534' 
  AND token = '4Ydk5Jrs4HaCpLjII+eBHeRDJf1HLdpOjCyY213ixU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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