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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85174ec2df39fe002ff00a7f6bedf0eb6027ed2b59ba8c238c255bb38a01ab5e' 
  AND token = 'WQ7pQmHzrgOvfZsKoYUCclCxZrxLdN5smciu1heHBzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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