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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4c00fab3e1fdaf70e3a4535bc9406dd6034b77e42c93abdd3c94edbb2c1e41d' 
  AND token = 'LGievjivZqTm9IRlTvOtt3aSuCGwVCgjrIxEN/5J89Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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