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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43586c89fd5690129a2c112203d1337f234bc6919809849d789750e788d9b228' 
  AND token = 'vD0GEdbr++wrthQQdRhpqzSHjY77MGW2tNklx5FYp+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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