SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '195e223b06a7ff816745745ab4dd60c564deb81b89f6e8599dc16ad67607fc13' 
  AND token = 'ZYCrx/byi+Ag+alzBajljPUKpgB86V40cJmZkw6bpN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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