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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '277bd3eef06511d20e97bc21fb237d5e3907c7009a2ee853b9716b9a7b548998' 
  AND token = 'yYL6fV8vVX3ep3Ho3c4HiO0D0VDxjpNCCdGGhhHCaEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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