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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b04904ed73ef70b64586dea925f43821dd5094a858eb45b7f0d180bbbe7c9d87' 
  AND token = 'jovNbTa6kljpABAUcq/T8skbu/XmlDpZyJwJRNPpOMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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