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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edbbb4f33f4012c6931a45388ba0db3dbaf163bfc3b0361f163078ac887b5cce' 
  AND token = 'tZomXBt5WKgiFKgS+ArWjXZffomBfP/2oFlpGK0nkB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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