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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85c8299a46bffbfeaf75c49aab6edf9f25f2414e45bd54b22ac16838081cd3f2' 
  AND token = 'nOUNDXCdHpn4mX2s0DPwAqf0T4W3zvP6/WMnA8wWSg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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