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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1e90eefe58c78f236364f74726303052815cd45480c9690307951e300ccbd69' 
  AND token = 'ru+hj8CfWZNzWOTLKlRkytBvU9E99tC3KPCChAtR2R0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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