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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d04f6e4ccfaab70744f9e83a1f6a81d28bc42f3bfb3a13185699f8ae5994335' 
  AND token = 'FXYmyYXvr4rMAAG225e7CsMhKgMeAv/dhZz6soSPNCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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