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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e34e6ff8f5a17173fe257b60a11cdafe102a7a3a69258f789a1fecddfb92601c' 
  AND token = 'lk6MTq12LuOtGujtRMX5KbruzO6e7jWmxQzzelbJlQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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