SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a07a6f904286fafca488b672abbc7be424a85423df15613e5d0583908da4b185' 
  AND token = 'pY+lGT6DFs3Gso8Ti3aMqrGwV3pSH5aK/AMaKZ1qJxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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