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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ae23bcd4bf7de34a0ea7527778c594c8913f5251415fe83b05b7de14d10e8b0' 
  AND token = '1Dx7iSbikGR2EJncTxyEitsInYyuIQxhh2PgQ7zpgiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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