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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f6fa5e370e01e0135438dce3eb62476e5727e42657204418bda6e7bd440d644' 
  AND token = 'W3Pze8mGjrv8U1z2Qy54rcm/Ym2Y7/scJfwnjc2uVGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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