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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '203d0f399b9a8ab35b73c18e00bbe246e4a13ab39d430c58bbbc05c34b79d540' 
  AND token = 'r4MObGJlg0ZnBfFnsHV/RcEFLZzosTelI+Y4GUDbWoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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