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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf11377bc384cb440d9afd16fcae4139ab65a3da41920e9e2c0880d5889074f4' 
  AND token = 'QlQCQV9dXERiLJMxJqBVbLepJMme+QL22Ns9WJOzJLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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