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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb660fdc5fc972e88b8b926db7a4c7eeb45e073080ab141f10aad3b752528092' 
  AND token = 'hI+PR86q0MYKEZt09n8lgrZ3pDfuD9jW45Umw11cA2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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