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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc1908b39c8cfd128f39da5cb9b6d13e038fbc8d61a4194de3cfc19ac7f7c4e8' 
  AND token = '6CF7Ye1vkzc+ZPyhlA7bdp31SKVhXv2WRLyVRj2IaFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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