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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e814cdc66e77c2dc4b9ba514a5c42bc3743a7d5dae8b7e7b8645ad14b656c151' 
  AND token = '80vRB0tKz5XptgiS1sZ95INZhNu0wtPeWWAxH4DYEc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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