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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4af664c04dec5b07f929b9b246c41d068f4a3e03f4561efdf26eaca9f54f2521' 
  AND token = 'hbVwVQsMoS25WriItxTCgZhjUOGTyMyc9Gr3CIR9oHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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