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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a4d9c4e576b0b1c37148b68a4d6a80bb8e29e37ebc716976c10cd0f6b3679cc' 
  AND token = 'mlGyrMpO9ALT4CpZnOJ8H9vLep8x0Zg+9WYqyp5ZtPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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