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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '229eefa5488fb47729fcb613745427662e411b40f2a39b75a2de662e9159b4e0' 
  AND token = 'F0HlakT3E+eYX4PBwqvnDjnNTPAz/7nQoXqIi0UUIeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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