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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '320d2348c641be32243cc3ffbba42abb24ed38bcda9555f59e9b044669da3b9c' 
  AND token = '9TbS92Bof01Qvjjeo85/z5Nk8ojMw9JTp77C9H/meJE=' 
  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"
    }
  }
}