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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba3dc6965e39e680e8799b4d16fee1d197dc84f294496293e69e8687a4105944' 
  AND token = '/Vovce+/aMvkJR4sY0WofYyZENbgho8Uy7hrGuZ+FrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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