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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bc93baa9d3123883184b8a2cf2cdeb43b3e2791e011d3f83965ade170c7ff0c' 
  AND token = 'hGvOA0uQFlXX87d42GkbwiawHTxW1isIkRdu6tM9CDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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