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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30b5f3e1813b69b195e7f1efc1e2b0d7ef023e2964261cd96dc790f6d679cc28' 
  AND token = 'vHwVvftQE2/AVs8lL5t0vuCHB3ZJrJ+k6CEw8v9VStY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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