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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5c6eee4e18a4fc3d288c632109e6597139a7a362642341978ce9ab0facf149e' 
  AND token = 'Q0Yl+RiYldL/xa3OAxITlvzJ2D/MnOi4DsggdvfGtYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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