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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c481da399ca8ebfd022bd84735064a7fe8d0755a566a1924fd58e7b3d7c83e10' 
  AND token = '4DoTuCNWlTtWUk5Y0hY06XIL7kIbmvK65QGip61jbw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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