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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9eea33d1f4fe37979cebb3dc6996ff0beef81f057db8d141c96523b939d6b8a' 
  AND token = 'GM3i0p/IRjPaOhiHK/ZM24rOumhyeVPQ5YbFyjcFuOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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