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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa697f765d3eddd5b6cc36f4b8195cab3ebd8f240d3d38147357bcc86e5e2d51' 
  AND token = '2kuxusTbVHobOCtSzYkraAkRjJ0SOyG7ln+6bADE6Rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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