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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e20ef51295dbebd2f2b9f24c5d3b588e023f706559191288c29d1131516c1565' 
  AND token = 'GnPH7j7KvGRLXIu14TG3C1KTxiLfBqHqzwDeNl1IhLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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