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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30ddd89c7d152a091aac5cbaed65482e0b4607068a530be34cdb5070854dd44c' 
  AND token = '2hpCVeCIewjJvSqcMOtnqUH8axTo/rC/gm9s5mySX/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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