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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8abe29299d7708b7f2efafaf29351f0f65d4f1227351d3feedefcb67b76f2747' 
  AND token = 'ccaeoy7k2oR8S0iBTWizQIF1glFoEYuqR1Q/NpZSg/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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