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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7be8caa5f56ef9dc01bfe5c72e5cf84670c50be5ac020e5cc72b661392b14723' 
  AND token = 'yOvM33E42UBaBSxiOpBw/ZK8igondL/0l6uVgfNDODY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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