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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'febb2b423acc9a90c299cc0d76ca6f6c2721b10730aaf57f2ff8b1e24b3690ca' 
  AND token = 'pUCM9qI6I0N9qWEuwFCyy9X7tWRMTQsrJpqTa0M3m1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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