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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0165663ee32a955d46d5b952c0ec5c69bcc881cef9abd4cac29b1a1d5c993a6' 
  AND token = 'ljEeEiwROMve8CzROKu3Bq8u3HQ0lKt0CItzoaLlMWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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