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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55b70de9bf6c072f43d49526d5a28ead3bd36166178606b74b06b27d26fc907f' 
  AND token = 'xfTHO43hd/Akvqq5cuyJTPlkM+W+/gfY2nW7xMXRDWU=' 
  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"
    }
  }
}