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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3487314c41409f9812ba032a5ec94053cec1c6fb050cd15e8b210c58c4bd212' 
  AND token = 'nWlKOjS1qqm4ytDRHPj1tZ1YqrkHT+z2upwSn2f7n7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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