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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9c051741573b7848f3a88335b110ce7f89c4632fd772a8a3681db8c7fdfa2b9' 
  AND token = '0dm0FkNUoVUhEM+n8x75RNnIwAfqlrYBPiSqYM+RMEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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