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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28b3ea3cf8affa1e3baba4e002b9528d5f70a03642bfaa95b2b8febd214f852e' 
  AND token = 'GhDdmpANPU9c3hAt+00KfoqKAbrdA3YxmKKsZ+1bNFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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