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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b60189bcb32279415e98c6fcfb48bd9fef2ddc37955a5e1f4bbed4d6da56c5c' 
  AND token = 'qyxTMT6btjh7OElCAy169G1d53AtPQk2dgtpBnZ1CvY=' 
  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"
    }
  }
}