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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81baf638b9cd5027e4af3a84df26b4a375d7712ab48b4eaf8d34f46e18383c13' 
  AND token = 'Yy+J85cTQMtsPFBAa4m/guyP4bMHAnfihj8hVsTYNOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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