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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1e4c69b8bd67584e3b2566ecfc325b87ceeed12a4956a196f394746da2c79b8' 
  AND token = 'fi2JO2iiRqkfHM1VAtPaTZzPF0UI9Aj603tuRUH0J4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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