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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11b6c46490d1d17d9bfeadf87385f98e0c4ba0a99d97d91beb67bb29be49ba8c' 
  AND token = 'c7KzAqZDgzJBx9RjPrk0UGlc42Ut53ZRPZrpnPZLSwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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