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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a97d94b9b28acac304fb1e66c30c8ad0d60fed7ae964dd0f93d2b850e0d2f5b8' 
  AND token = 'QbnHnPB0UARb62TMquHuJy5oq3IoJevRwQ/yFNgZb1A=' 
  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"
    }
  }
}