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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67637aa4baa8c8c9af7d9bcfe5227d956418bba77461ff1c187b603400da9ee2' 
  AND token = 'wtHrvkN0LrpVySq7VnzhL9hxr0V1btbSGYhWwIIa7t8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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