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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3894ae7e8506a14a487619ed7d963099f3e3d714fd8a05172d0ad9f42460ae76' 
  AND token = 'Oxee9pDKZIEsE6O9GqVlGNtz+VOX7gM3xAoziF/zp/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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