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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4427dc209c33ec7d2d5e6fdedb7b1af8fc9788f8a6418c94f21ac7e778ec99c' 
  AND token = 'UEwZHTbh7PbphxKAu0ovP3ql6F+AzdHyiu2AapraZN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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