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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ce5ce6daf8ec335211bc19168126212c5756e408b06f6042bb3884cdeb2756c' 
  AND token = '2txAk/g8k7+htRZQooYrXEwZwtdmWA8iJpUPNOrM8eY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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