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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee203890c58ae108db2ab87b06c03be1167546e8e5c33f3e2a7dcfef037eba72' 
  AND token = 'oou+rNztzc31I/KCj1J9OvVmOgqfSC1wxt9lNwmfL7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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