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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9d258bd57ccd83e853d753b952a7b983b28e2de8e07fc512f9f181aea5e210f' 
  AND token = '8OcWGoWvwZD3n0uTbjThAp/1JRXEqIQjUwCcugI1Gw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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