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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbb49eb080c28afbb2fffa2c9ec4465df5aa197512fbfec07786b7489baef6b4' 
  AND token = 'd/4mUI64/KLfr7uzKkV7yPgx0Vcjb3l7XtJTHIET11E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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