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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '252adf4a4ab15245847f3fd6714a5239a627e6f4fdf167b2e338940c238c1e65' 
  AND token = 'KNBlj44tj61jV45+AG6EHo7ygs+yGtKuC2u4aCyg9sw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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