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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77a8b7b6ed02e4aeb3d69ff91b3ce69555c908b11f94c2751e207c49962db81f' 
  AND token = 'hAAp/fh41G/xgfuyJKDaDA5ROXtN4CV5w/9whf1E7HE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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