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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b8e98e974cff061c8117ebf6b49892103a6f4ab30c8018e29397dcbef4f906d' 
  AND token = 'w1YosfRz/Mhkv2xt/VGYEK2gG+k9+cGpoCkgY6xflkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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