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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa118550c6c6661b07e330e177b507da6ca0d0a597b4b39676426822f4b74d44' 
  AND token = 'fucbYw34T4gmka0c1YV9tOmXzAf3jBIhBbG/rAO1vRk=' 
  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"
    }
  }
}