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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b9185cbeb9e4dd057eb84c971efe3be17563719a6b0943dfbb14ee826c70d49' 
  AND token = 'sWXtHobYLplNSQRBVtgoo0VrPKTb+BWef8YFzR0hdUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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