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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11f0b1074f0aeb6c8e4eab5923f97f5f5365dfe2d9f22e0ce3cd013d366b5885' 
  AND token = '39jzYqhgxltSjC2b43lzX0G1EEyPuLxvgU7Ho9XnF4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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