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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11230e80232cc83a083fa9d0e7b68f4e941973ba3964966b08c70cd04718c399' 
  AND token = '9fafjjM7KTxZ4HX+NmP9J/jwroARAjGdrA9B+igixuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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