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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c04d77d7e7e1d8c1710c3395d6325d9cf3f7d4f2dfe5093162364a57cf2f852' 
  AND token = '3G19XX3T3nu29lmgthg5Ok/+3BrgakW6D6/NzdvhGTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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