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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa2e36c0584cfbd0cb51660df92596f4ec1c68a76c16d66a4695a0a34b6ce16a' 
  AND token = 'n4PF1jWcFSzg0btvSJzkbwgPzfuFtxxZcseKy6ATnUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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