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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f78db90f0eb10536447ff481c6d200e3994779b223b3d28d458f62516be1683' 
  AND token = 'g4BteUD3biewCCFNkCdrDpJj1LYFM/sjmG4h4QXkgOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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