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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ef9e3f5dc12ef6366235ff9f5349349083a4aac9c916a8f393447180882ff52' 
  AND token = 'N+5znUSgTijQ6sUMpkmSf67ZfXKocYybR/TnSOb+aFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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