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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65bc2d07c3d6d9e7911be27002b59bdc2b0d896611ba9ee2fa083ee0509954c3' 
  AND token = 'O3xf7xRg5ZxCPAEReEhAkRWIpu0vFtlzLssFolEaveU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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