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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8340c27b399f30925023e39f034b58ef9d0f02b3dc4a13a5a826567f4a78d631' 
  AND token = 'YCnwzclSEiyd6SSZeS3jE09Zua2JboXvi1iR+3ftGfc=' 
  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"
    }
  }
}