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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1be6886104d156e0a8f0f181727d7cd0e10d8e14a43c65008a9a01cdca5ad50a' 
  AND token = 'dEvgxiXCazCYGklilyK24Gyx2ua2izi2EbxcgzJ9PZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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