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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7eaa9237c6bc2429bf991b7a2c9c8d54dfd8e0ce48ebf7829db2fd9cf0bad68' 
  AND token = 'auNae0OJvHbJX+NERz4POXOuqsQQsm4X25Guseq+80g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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