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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '954f619197de52ab2c4d4b1f0a6d5575747351c992f87fcf5ba2181d28b4d9e5' 
  AND token = 'QudrnJsWXrqUaYjn6K0mfTQG2dxslv3MyyEGXARQ3p8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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