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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f95fc01e006fdc88d1e1a265bc63dd17f9f56f045338bc67098cf21b283c733a' 
  AND token = '6B8B/yYki74PBBMxb/b+4fNdw8bxvH+qXeq6SaEPI4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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